Four tomato lines introgressed from Lycopersicon chilense were compared with the commercial F 1 hybrids ÔARO 8479Õ and ÔHA 3108Õ, which are tolerant to Tomato yellow leaf curl virus, and the cv. ÔCampbell 28Õ as a susceptible control. Resistance was evaluated by the use of grafted diseased scions as well as in a field trial where plants infected by viruliferous whiteflies and disease-free plants were transplanted in paired rows. The new lines LD 3, LD 4, LD 5 and LD 6 showed no disease symptoms after grafting or in the field trial. Virus accumulation at 60 days after transplanting was low in the infected plants: 0.09, 0.60, 1.00 and 0.50 ng, respectively. No fruit-set or yield losses were registered under the high temperature conditions prevalent in the trial, in which lines LD 5 and LD 6 were better adapted to tropical conditions. Viral DNA concentrations were over 1000 ng in the cvs. ÔCampbell 28Õ, ÔARO 8479Õ and ÔHA 3108Õ. The last two are considered tolerant as they were asymptomatic or had mild symptoms, respectively, but achieved acceptable yields in the trial. By contrast, virus had a negative effect on fruit-set, number of fruit per plant and total yield in the cv. ÔCampbell 28Õ.
M. Piñón. 2011. Performance of tomato (Solanum lycopersicum) cultivars in a tropical sheltered production system. Cien. Inv. Agr. 38(2): 211-217. Off-season vegetables become expensive so new technological systems are required to grow cultivars well adapted to climatic conditions throughout the year. Accordingly, a trial was performed to test 12 tomato F 1 commercial hybrids in a Cuban sheltered installation based on the "umbrella" effect recommended for tropical conditions. The main goal of the trial was to study cultivar productivity and adaptation traits before offering recommendations to growers. The ´37242´ (7.4 kg plant -1 ) and ´Setcopa´ (7.1 kg ha) F 1 hybrids showed the highest marketable yields, commercialized at 93% and 87%, respectively. The performance of the ´37242´ was notable; its high fruit set (87%) during the hot and wet season showed its adaptation to the local conditions. The studied cultivars were asymptomatic to tomato yellow leaf curl virus (TYLCV), despite its high prevalence in the area.
Three tomato (Solanum lycopersicum) lines and a variety reported to be resistant to tomato yellow leaf curl virus (TYLCV) in Cuba were tested against a TYLCV isolate from the Reunion Island (TYLCV-Mld [RE]) as well as an Israeli resistant line TY-172 and TYLCV-susceptible lines R-13 (Israel), 13-8-2 (Cuba) and cv. 'Farmer.' Resistance was evaluated by using viruliferous whiteflies and virus-infected scions. The TYLCV-resistant lines: 13-8-1, LD 5, LD 6, TY-172 and cv. 'Vyta' did not show viral disease incidence and symptoms in the plants. On the contrary, the TYLCV-susceptible lines R-13, 13-8-2 and cv. 'Farmer' showed TYLCV-Mld [RE]-like strong symptoms after vector inoculation and grafting. The development of cultivars resistant to various TYLCV isolates present indifferent geographical areas should be possible by use of resistant germplasm.
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